I've got the voodoo shorties on my 08, planning to turbo but didn't feel like spending a ton of cash on an exhaust until I have the $$ for my project. I haven't noticed any problems. The stock ECU should keep the A/F ratio right on, though I recommend doing the PAIR block off. I would suggest putting some more heat shielding on the inside of the faring piece that comes below the stock exhaust midpipe on the right side of the bike, you'll feel a lot of heat coming out of those pipes. Just my two cents.